You own the key… You make the rules, and control his release. If you set a release date for him, occasionally use that release date to make him BEG you you extend his chastity sentence.

He may not want to at first, but smother him with love, and tell him you will make it worth his while. He will be putty and so much more your submissive! This will get easier after time, and makes his release so much more precious!